With recent development of smart-cut wafer-bonding technique [1]}, high-quality thin film single-crystalline LN on insulator (LNOI) has enabled on-chip high quality factor (Q) LN resonators [2]}, and provided a promising chip-scale system for various nonlinear optics applications [3]}, [4]}, [5]}, [6]}, [7]}. Due to the narrow linewidth of the resonances, LN high-Q microresonators also offer an opportunity to study the refractive index variation induced by the PR effect. The enhanced intracavity optical intensity significantly boosts the PR effect and leads to observations of novel phenomena such as photon-level tuning of resonances and quenching of the PR effect [8]}, [9]}, [10]}, [11]}.
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